KR19990013925A - Battery pack - Google Patents

Abstract

A pack battery charges a secondary battery by controlling a secondary coil, a secondary coil electromagnetically coupled to a primary coil embedded in a charging stand, and electric power induced by the secondary coil. The control circuit is built in.

The alternating current generated in the secondary coil embedded in the pack battery is controlled by the control circuit to charge the secondary battery.

Description

Pack Battery and Charging Base

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pack battery and a charging stand for charging electric power by transferring electric power through an electromagnetic induction action without passing through a charging contact point.

The pack battery is mounted to be detachable from the portable electric device.

For example, a portable electric device equipped with a pack battery displays a charging terminal on the bottom of the pack battery so that the battery can be charged while the pack battery is mounted.

On the other hand, the discharge terminal of the pack battery is a terminal for connecting to the portable electric equipment, and can be provided inside the state in which the pack battery is mounted on the portable electric equipment.

However, the charging terminal needs to be mounted in a position to be exposed to the outside at all times because it is necessary to attach the portable electric device to the charging stand and to contact the power supply terminal of the charging stand. For this reason, the charging terminal is exposed to an extremely polluted environment, and when it is mounted on the charging stand, there is a drawback that it is easy to cause contact failure. In particular, in order to charge the pack battery in a more normal state, the number of charge terminals is gradually increasing so that the pack battery can be charged while detecting the type or state of the pack battery.

In this type of pack battery, it is difficult to bring all the charging terminals into contact with the charging stand so that contact failure does not occur.

If the secondary battery is charged while all of the charging terminals are not normally in electrical contact, for example, a large current is charged by identifying a type of the secondary battery included in the pack battery, thereby improving battery performance. It is caused to decrease or to charge in a state in which the battery temperature is not normally detected, and to deteriorate battery performance.

In addition, since the charging terminal of the pack battery is exposed while the portable electronic device is mounted on it, when carrying the portable electric device in a pocket or a bag, a metal product or a metal cord inserted with the bag is placed on the charging terminal. Defective conditions such as contact and a short are generated.

In order to alleviate such drawbacks, portable electric devices and charging stations have been developed in which a secondary battery is charged with a contactless contact.

In this method, a primary coil is embedded in a charging station for mounting a pack battery or a portable electric device, a secondary coil is embedded in a portable electric device, and electric power is transferred from the primary coil to the secondary coil by an electromagnetic induction action. Charge the secondary battery. The portable electric device rectifies the alternating current induced by the secondary coil and converts it into direct current. The direct current is controlled by a control circuit, and supplied to the pack battery to charge the secondary battery. The pack battery and the portable electric device are connected via the charge and discharge terminals. When charging the secondary battery of the pack battery, the portable electric device is mounted on the charging stand. In this state, electric power is supplied to the secondary coil of the portable electric appliance from the primary coil of the charging stand, the output of the secondary coil is controlled by the control circuit, and electric power is supplied from the portable electric appliance to the pack battery. Is charged. When the portable electric device is separated from the charging stand, electric power is supplied from the pack battery to the portable electric device, and the portable electric device can be used.

The portable electric device incorporating the secondary coil and the control circuit does not need to expose the charging terminal to the pack battery to be mounted.

For this reason, there is a special advantage that the portable electric equipment can be mounted on the charging stand to charge the secondary battery of the pack battery without contact. However, the charging system of such a structure cannot charge the pack battery in a state separated from the portable electric apparatus. For this reason, there exists a drawback that a spare pack battery cannot be mounted and charged in the state which is using the portable electric apparatus.

Moreover, the charging system of such a structure needs to connect a pack battery to a portable electric device as a control terminal. However, when the control terminal has a poor contact, the secondary battery cannot be charged normally.

In this state, the secondary battery may be in a state in which the secondary battery cannot be safely charged, or in a state in which the battery performance is significantly reduced by charging.

This is because the charging circuit built in the portable electric device cannot be charged while detecting the state of the pack battery normally.

The present invention has been developed for the purpose of solving such drawbacks.

An important object of the present invention is to provide a pack battery capable of charging a built-in secondary battery without contact, without providing a charging terminal in the pack battery.

In addition, another important object of the present invention is to eliminate the charging failure of the secondary battery caused by poor contact, and to pack the rechargeable battery in an ideal state in a safe state, and furthermore, it can be charged without degrading the battery performance To provide.

1 is a schematic cross-sectional view of a portable electric device and a charging stand in an embodiment of the present invention.

Degree.

2 is a pack battery mounted to a portable electric device according to an embodiment of the present invention;

Schematic of charging station.

3 is used in combination with a control circuit and a protection circuit according to another embodiment of the present invention.

Flowchart of the operation circuit of the microprocessor.

Figure 4 is an enlarged perspective view showing the internal structure of the pack battery.

Fig. 5 is a sectional view of a pack battery in another embodiment of the present invention.

FIG. 6 shows a state in which the pack battery shown in FIG. 5 is attached to a charging stand. FIG.

Schematic cross section.

7 shows the voltage-current characteristics of a secondary coil installed near to an aluminum plate.

Graph.

8 is a graph showing the voltage-current characteristics of a secondary coil installed near to an iron plate;

F.

9 is a secondary installed close to the wide surface and the back of the aluminum outer can

Graph showing the voltage-current characteristics of the coil.

10 is a voltage-current of a secondary coil installed by approaching the side of an aluminum outer can.

Graph showing characteristics.

Figure 11 shows the voltage-electricity of the secondary coil installed near the upper and lower surfaces of the aluminum can.

Graph showing flow characteristics.

12 is a view of the secondary coil installed to approach the wide surface and the back of the iron outer can

Graph showing voltage-current characteristics.

13 is a voltage-current characteristic of a secondary coil installed near the side of the steel outer can

Graph representing.

14 shows the voltage-current characteristics of the secondary coil installed near and on the upper and lower surfaces of the steel outer can.

Graph showing gender.

Fig. 15 is a view of installing a secondary coil by approaching an outer can of a rectangular secondary battery.

A perspective view showing the womb.

16 shows a charging stand according to an embodiment of the present invention, and the number of pack batteries installed in the charging stand.

Straight cross section.

FIG. 17 is a vertical view of the charger shown in FIG. 16 and a pack battery mounted to the charger.

Longitudinal section.

18 is a charging table according to another embodiment of the present invention and attached to the charging table.

Vertical cross section of pack battery.

FIG. 19 is a vertical view of the charger shown in FIG. 18 and a pack battery mounted to the charger.

Longitudinal section.

20 is a charging table according to another embodiment of the present invention and mounted on the charging table.

Vertical cross section of pack battery.

21 is a charging table according to another embodiment of the present invention and attached to the charging table.

Vertical longitudinal section of the pack battery.

(Explanation of symbols for the main parts of the drawing)

101 ... charging base 101A ... mounting part

102 ... pack battery 103 ... portable electric equipment

104 Case 105

106 ... power terminal 107 ... hook lug

108 ... recess ... 109

110 ... 111

112 ... exterior can 112A ... wide surface, back side

112B ... Width wide side 112C ... Width wide bottom

113 ... Primary coil 114 ... Secondary coil

115 ... Power supply circuit 116 Rectifier circuit

117 Switching elements 118 Oscillation circuit

119 ... ferrite core 120 ... control circuit

121 Protection circuit 122 Rectifier circuit

123 ... Charging control unit 124 ...

125 ... current detector 126 ... voltage detector

127 ... control unit 128 ... printed board

129 ... electronic components

The pack battery contains a secondary battery. The secondary battery is charged by being installed on a charging stand while the pack battery is mounted on a portable electric device, or the pack battery is directly mounted on the charging stand to be charged.

In addition, the pack battery has a discharge terminal that is exposed to the outside of the case, and does not include a charging terminal for charging the secondary battery. The discharge terminal is electrically connected to a power supply terminal of the portable electric device with the pack battery mounted on the portable electric device.

The pack battery is supplied with electric power for charging the built-in secondary battery from the primary coil embedded in the charging stand.

The primary coil of the charging station supplies the charging power of the secondary battery incorporated in the pack battery in a non-contact state, and is connected to a power supply circuit that excites the alternating current.

The pack battery has a secondary coil which is electromagnetically coupled to the primary coil embedded in the charging stand, and a control circuit for controlling the state of charge of the secondary battery by changing the AC output of the secondary coil to DC.

In the pack battery, AC power is induced from the primary coil to the secondary coil, and the AC power is controlled by a control circuit to charge the built-in secondary battery.

A pack battery having this structure has a feature that can be charged in a contactless manner without providing a charging terminal. This is because the control circuit controls the power generated in the secondary coil embedded in the pack battery to charge the secondary battery. Therefore, the pack battery can charge the secondary battery by controlling the power induced in the secondary coil built in the control circuit without supplying and charging the charging power from the portable electric device. Therefore, the pack battery does not need to be connected to the portable electric apparatus through the contact in order to charge the secondary battery.

The pack battery can be fully charged (fully charged) by monitoring the state of charge of the secondary battery in a control circuit built therein.

The pack battery to be charged in this state does not need to connect the terminal for charging to the portable electric device and the charging stand, nor does it need to connect the terminal for detecting the state or type of the battery to be charged. The pack battery is in a completely contactless state, and the secondary battery can be charged in an ideal state.

In addition, the pack battery of the present invention does not supply charging power from the charging stand to the portable electric device, and supplies the charging power from the portable electric device to the pack battery. From the charging stand, the charging power is supplied directly to the pack battery in a contactless state by using the action of electromagnetic induction without passing through the portable electric device. The pack battery charged in this state can be charged from the charging stand without going through the portable electric device. Therefore, the pack battery can be charged directly from the charging stand without being mounted on the portable electric device.

This structure charges a spare pack battery with a charging stand, and realizes the feature which can be used conveniently.

In addition, the pack battery of the present invention eliminates the charging failure of the secondary battery due to a poor contact of the charging contact, and realizes the feature that the secondary battery can be charged safely and without degrading the battery performance in an ideal state. do.

This is because the pack battery incorporates both the secondary coil and the control circuit to charge the secondary battery by controlling the power induced in the secondary coil in the control circuit.

The above and other features of the present invention will become more apparent from the following detailed description and reference drawings.

(Example)

FIG. 1 shows a pack battery 102 in which a secondary battery 111 is incorporated, a portable electric apparatus 103 and a charging base 101 on which the pack battery 102 is mounted. The portable electric device 103 shown in this figure has a pack battery 102 mounted on the back thereof freely.

The charging base 101 has a mounting portion 101A for mounting the portable electric device 103 on which the pack battery 102 is mounted in place. Although the portable electric device 103 in this figure is a mobile phone, the present invention does not specify the portable electric device 103 as a mobile phone. The portable electric device may be, for example, an electric razor or an electric toothbrush.

The portable electric device 103 is supplied with power from the pack battery 102. Therefore, the pack battery 102 has a discharge terminal 105 to be exposed to the outside of the case 104.

The portable electric device 103 has a power supply terminal 106 in contact with the discharge terminal 105 in a state where the pack battery 102 is mounted.

The pack battery 102 shown in the figure is provided on the surface opposite to the mounting surface of the portable electric device 103, and the discharge terminal 105 is provided.

The discharge terminal 105 provided here attaches the pack battery 102 to the portable electric device 103 and contacts the power supply terminal 106 provided in the portable electric device 103.

The pack battery 102 is provided with a hooking projection 107 at the lower end of the case 104 and a hooking recess 108 at the upper end surface of the case 104. The hook protrusion 107 is inserted into the hook portion 109 provided in the case of the portable electric device 103. The hook recess 108 is elastically inserted with the locking mechanism 110 installed in the portable electric device 103.

The pack battery 102 of this structure moves the locking tool 110 upward, and is detached and attached to the portable electric device 103.

The lock 110 is elastically inserted into the hook recess 108 so as to be mounted on the portable electric device 103 so that the mounted pack battery 102 does not come off. The pack battery 102 of this structure can be easily attached to and detached from the portable electric device 103 by operating the locking mechanism 110. However, the present invention is not limited to the above structure in which the pack battery is mounted on the portable electric device, and can be any structure that can be detachably attached to the portable electric device.

The pack battery 102 is not provided with a charging terminal, and, by the action of electromagnetic induction, transfers electric power from the charging stand 101 to charge the secondary battery 111. In order to convey electric power by the action of electromagnetic induction, the charging stand 101 has a built-in primary coil 113, and the pack battery 102 has a built-in secondary coil 114.

The primary coil 113 and the secondary coil 114 are electromagnetically coupled so that electric power is conveyed from the primary coil 113 to the secondary coil 114.

In order to efficiently transfer power from the primary coil 113 to the secondary coil 114, the primary coil 113 and the secondary coil 114 are arranged as close as possible.

The charging base 101 is provided with the primary coil 113 on the inner surface of the mounting surface. The primary coil 113 is connected to the power supply circuit 115, as shown in the circuit diagram of FIG. The power supply circuit 115 includes a rectifier circuit 116 for converting an AC of commercial power input from a diode into a direct current to a smooth direct current with a smoothing capacitor, and a switch connected in series with the primary coil 113. A field-effect transistor (FET), which is an element 117, and an oscillation circuit 118 for turning ON and OFF the switching element 117 are provided.

The oscillation circuit 118 switches the switching element 117 ON and OFF at a frequency of, for example, 50 kHz to 500 kHz, preferably about 100 kHz. The switching element 117 switches the direct current output from the rectifier circuit 116 to excite the primary coil 113 in alternating current.

The primary coil 113 is provided with a ferrite core 119 at the center, as shown in FIG. 1, in order to efficiently transfer electric power to the secondary coil 114 by the action of electron induction.

The pack battery 102 includes a secondary battery 111, a secondary coil 114 electromagnetically coupled to the primary coil 113 of the charging base 101, and an AC output of the secondary coil 114 by direct current. The control circuit 120 converts the secondary battery 111 to control the state of charge of the secondary battery 111, and the protection circuit 121 protects the battery by blocking current when the battery is used in an abnormal state.

The pack battery 102 is preferably a secondary battery 111 and preferably contains a lithium ion secondary battery. The pack battery of a lithium ion secondary battery is light and can enlarge a charge capacity. However, a nickel-hydrogen battery or a nickel-cadmium battery can also be incorporated as a secondary battery. Nickel-cadmium batteries can be discharged with large currents, and nickel-hydrogen batteries have features that can increase the charge capacity to volume.

As shown in FIG. 1, the secondary coil 114 may be installed to approach the primary coil 113 in a state in which the portable electric device 103 is mounted on the charging base 101. On the inner surface of the case 104, it is provided in the back surface which opposes the primary coil 113. As shown in FIG.

The secondary coils 114 are preferably hollow to prevent the pack battery 102 from lightening and do not provide a core.

However, the core may also be installed in the secondary coil to efficiently transfer power from the primary coil to the secondary coil by the action of electron induction.

As shown in the circuit diagram of FIG. 2, the control circuit 120 includes a rectifying circuit 122 for rectifying and converting an alternating current output by inducing the secondary coil 114 into a direct current, and an output of the rectifying circuit 122. A charge control unit 123 connected in series with the secondary battery 111 to control the state of charge of the secondary battery 111, an arithmetic circuit 124 for controlling the charge control unit 123, The current detection unit 125 for inputting the charging current of the secondary battery 111 to the calculation circuit 124, and the voltage detection unit 126 for inputting the input voltage to the calculation circuit 124.

The charging control unit 123 controls the output of the rectifier circuit 122 to be optimal voltage and current for charging the secondary battery 111, and stops charging when the secondary battery 111 is fully charged. Therefore, the charging control unit 123 is controlled by the constant voltage constant current circuit for stabilizing the output of the rectifier circuit 122, the operation circuit 124, the switching element for stopping the charge when the secondary battery 111 is fully charged It is provided. The constant voltage constant current circuit detects the charging current and the battery voltage, and controls the output to the constant current and the constant voltage. The switching element is connected in series with the secondary battery 111.

When the switching element is ON, the secondary battery 111 is charged, and when the switching element is OFF, charging is stopped.

The calculating circuit 124 detects the charging current and the voltage of the secondary battery 111 and controls the switching element of the charging control unit 123.

The calculation circuit 124 turns on the switching element until the secondary battery 111 is fully charged, and when the secondary battery 111 is fully charged, it is switched from ON to OFF to stop charging.

The lithium ion secondary battery may detect a full charge by detecting a charging current or a battery voltage. The lithium ion secondary battery is first charged with a constant current, and then charged with a constant voltage. In the process of constant voltage charging, the charging current decreases as it is fully charged. Therefore, by detecting that the charging current is smaller than the set value, it is determined that the battery is fully charged, and charging can be stopped. In addition, when the battery voltage rises to the set voltage, it is determined that the battery is fully charged and charging can be stopped.

Nickel-hydrogen batteries and nickel-cadmium batteries are fully charged by constant current charging. This type of secondary battery has a property in which the battery voltage decreases slightly when fully charged. For this reason, there exists a property in which a battery voltage falls somewhat. For this reason, it is possible to detect that the battery voltage is lowered, that is, ΔV, to detect full charge.

The protection circuit 121 detects the battery voltage and the current flowing through the battery, and controls the current interruption element of the control circuit 127 to be ON or OFF.

The current blocking element is, for example, a transistor or an FET.

When the battery voltage is higher or lower than the set voltage, the protection circuit 121 turns off the current interruption element of the controller 127 to cut off the current. Further, even when excessive current flows in the battery in an abnormal state, the current interrupting device is turned off to cut off the current.

The pack battery 102 shown in the figure comprises a control circuit 120 and a protection circuit 121 as respective circuits. However, the arithmetic circuit of the control circuit may have a function of a protection circuit, and the control circuit may be used together as a protection circuit. It is also possible to use the switching element of the charge control unit together as a current interruption element controlled by the protection circuit. The arithmetic circuit can be realized in an analog circuit that processes an analog signal such as a voltage or a current to control a switching element, or can be configured in a microprocessor such as a one-chip microcomputer. The operation circuit of the microprocessor converts the voltage and current into digital signals in the A / D converter.

The computing circuit of the microprocessor used in combination with the control circuit and the protection circuit controls the switching element in the flowchart of FIG. 3. In the flowchart of this figure, the microprocessor controls the switching element to ON only when the secondary battery is not fully charged and the battery voltage and current are within the set range, so that the battery is fully charged, or the battery voltage and current are When not in the set range, the switching element is controlled to OFF.

4 shows an internal structure of a pack battery incorporating a secondary coil, a control circuit, and the like.

The pack battery in this figure is provided with a printed board 128 in parallel with the square secondary battery 111. In this figure, the printed circuit board 128 has a secondary coil 114 mounted on the surface on the right side, and an electronic component 129 for realizing a control circuit and a protection circuit on the left side.

The secondary battery 111 and the printed circuit board 128 in FIG. 4 are put in a plastic case (not shown), for example, to form a pack battery. The pack battery of this internal structure is suitable for each type which thinned the whole. The pack battery may have a cylindrical secondary battery 511, as shown in FIG. 5, to make the overall shape cylindrical. In the pack battery 502, a printed circuit board 528 having an almost identical appearance to that of the battery is provided at the end of the cylindrical secondary battery 511. FIG. The printed circuit board 528 is equipped with an electronic component 529 for realizing a control circuit or the like on the surface facing the battery, and a secondary coil 514 on the other surface. The pack battery 502 of this embodiment has a feature that allows the secondary coil 514 wound in a circular shape to be stored in the pack battery 502 so as not to be a waste of space.

As shown in FIG. 6, the pack battery 502 of FIG. 5 is mounted on a charging table 501 having a primary coil 513 on the opposite surface of the secondary coil 514, and the secondary battery is built therein. The battery 511 is charged.

The pack battery has the structure shown in FIGS. 16 and 17 again, and can be attached to the charging station 1601. The pack battery 1602 shown in the above figure is detachably mounted on the rear surface of the portable electric device 1603 and mounted on the charging station 1601 through the portable electric device 1603.

In a pack battery incorporating a secondary coil, the secondary coil needs to be placed close to the secondary battery. This is because the secondary battery and the secondary coil are incorporated in the small pack battery. The electric power induced in the secondary coil embedded in this state is affected by the metal installed around it, that is, the outer can of the secondary battery. This is because the outer can changes the magnetic flux radiated from the primary coil.

In order to lighten the whole, a pack battery uses the type which makes an exterior can aluminum for the built-in secondary battery. However, when the secondary coil is placed close to the outer can made of aluminum, the power that can be conveyed from the primary coil to the secondary coil is significantly reduced.

FIG. 7 shows that the voltage-current characteristics of the secondary coils installed in parallel to the primary coil are affected by the aluminum plate provided near the secondary coils.

8 shows that the aluminum plate is changed to an iron plate, and the voltage-current characteristics of the secondary coil are measured under the same conditions.

This figure was measured under the following conditions.

① Primary coil and driving circuit are MSE177E made by TDK for cordless telephone.

② The secondary coil is TSE's MSE177F for cordless telephones.

(3) An alternating current obtained by switching a direct current of 141 V to a frequency of 120 kHz was applied to the primary coil.

④ The distance between primary coil and secondary coil is 4mm.

⑤ The output of the secondary coil was rectified with a diode (RK33) and smoothed with a smoothing capacitor (200 μF).

(6) An aluminum plate or iron was installed in parallel with the secondary coil near the primary coil.

⑦ Aluminum plate and iron should be 2mm thick and 30 × 50mm long. The primary coil and the secondary coil were formed at the center of the aluminum plate or the iron plate with a winding appearance of about 20 × 30 mm.

(8) The distance between the aluminum plate and the iron plate and the secondary coil was changed to 0 to 8 mm to measure the voltage-current characteristics induced by the secondary coil.

As shown in FIG. 7 and FIG. 8, the secondary coil approaching the aluminum plate has the same load current as the iron plate, and the output voltage is considerably lowered. This means that when the secondary battery of the aluminum outer can approaches the secondary coil, the current induced by the secondary coil is extremely reduced, and power cannot be efficiently transferred.

Since the pack battery of the present invention is made of an outer can made of iron, the induced power of the secondary coil can be made larger than that of a built-in secondary battery of an aluminum outer can.

In particular, as the secondary coil approaches the outer can, the characteristic becomes more remarkable. As indicated by the marks in Fig. 7, the secondary coils in close contact with the aluminum plate have an output voltage lowered to 80% as compared with the state without the aluminum plate, and are almost unusable. On the other hand, as shown by the secondary coil in close contact with the iron plate, the output voltage is higher than the state without the iron plate in the region where the load current is small, so that a considerable current can be output.

Therefore, the pack battery of the present invention, which is provided with a secondary coil approaching a secondary battery of an iron outer can, has a feature that can make the outer coil compact and efficiently guide the secondary coil efficiently.

Packed batteries in which the outer can is made of iron or iron alloy are made of an outer can, for example, stainless steel, or the surface of which is made of metal plated iron.

The pack battery can improve the power induced in the secondary coil by specifying the relative position between the secondary coil and each type of secondary battery.

9 to 11 show voltage-current characteristics of secondary coils installed by approaching each type battery of an aluminum outer can.

12 to 14 show voltage-current characteristics of secondary coils installed by approaching each type battery of an iron outer can.

9 and 12 show the voltage of the secondary coil 1514 which is provided close to the wide surface and the rear surface 1512A of the outer can 1512 of each type of secondary battery 1511 shown in FIG. Current characteristics are shown.

10 and 13 show the voltage-current characteristics of the secondary coil 1514 that is provided near the side surface 1512B of the outer can 1512 of each type of secondary battery 1511 shown in FIG. 15. 11 and 14 show the voltage-current characteristics of the secondary coil 1514 that is provided near the upper and lower surfaces 1512C of the outer can 1512.

These figures were similarly measured in the measurement of FIG. 7 and FIG. 8 except having changed the aluminum plate and the iron plate into the secondary battery of an aluminum exterior can and the secondary battery of an iron exterior can.

However, the secondary battery used the following dimension.

(1) As for the secondary battery of the aluminum outer can, the outer can was made into an outer can having a thickness x width x height and 8.1 x 22 mm x 48 mm.

(2) The secondary battery of the iron outer can was used so that the outer shape of the outer can was set to thickness x width x height and 6.1 x 17 mm x 48 mm.

(3) The distance between the outer can of the secondary battery and the secondary coil was changed to 0 to 8 mm to measure the voltage-current characteristics induced by the secondary coil.

As shown in Fig. 9 and Fig. 12, the secondary coils provided on the wide front and rear surfaces 1512A of each type significantly deteriorate in voltage-current characteristics.

In particular, as the secondary coil approaches the wide front and rear surfaces 1512A of the outer can 1512, the voltage-current characteristics of the secondary coil are lowered.

On the other hand, as shown in FIG. 10 and FIG. 13, FIG. 11 and FIG. 14, the secondary coils disposed close to the narrow width surface of the outer can do not deteriorate much in voltage-current characteristics even when the outer can approaches. The voltage-current characteristics can be remarkably improved as compared to the secondary coils provided on the front and rear surfaces 1512A.

The pack battery, in which the secondary coil is approached with a narrow width, is made of an outer can of the built-in secondary battery made of iron alloy such as steel, stainless steel, or aluminum.

16 and 17 show a charging stand 1601 and a pack battery 1602 mounted to the charging stand 1601. The pack battery 1602 of this figure is detachably attached to the rear surface of the portable electric device 1603 and is mounted to the charging base 1601 through the portable electric device 1603.

As shown in FIGS. 16 and 17, the secondary coil 1614 built in the pack battery is arranged to approach the primary coil 1613 with the portable electric device 1603 attached to the charging station 1601. In the case 1604 of the pack battery 1602, a bottom face of the pack battery 1602 is provided. It is preferable that the secondary coil 1614 has no core in order to make the pack battery 1602 lighter. However, the core may also be installed in the secondary coil, so that efficient power transfer may be performed from the primary coil to the secondary coil by the action of electromagnetic induction.

In the pack battery 1602 shown in FIGS. 16 and 17, a secondary coil 1614 is provided below the secondary battery 1611. The secondary coil 1614 is provided at the bottom of the case 1604 under the secondary battery 1611. The secondary coil 1614 is provided at the bottom of the case 1604 at the center side in the longitudinal direction of the case 1604 and the battery, that is, in the vertical direction of the figure.

The case 1604 of the pack battery 1602 is formed by molding a plastic into a thin rectangular box shape, and has a rectangular secondary battery 1611 embedded therein. The rectangular secondary battery 1611 has a rectangular outer can 1612 wider than the thickness thereof.

The exterior can 1612 has the shape which connected the periphery of the wide front and back surface 1612A located in front and back by the narrow width surface.

The narrow width includes both side surfaces 1612B connecting both edges of the wide front and rear surfaces 1612A, and the upper and lower surfaces 1612C connecting the upper and lower edges of the wide front and rear surfaces 1612A.

The height of the rectangular case 1604 is higher than that of the rectangular secondary battery 1611, and a gap is formed in the bottom of the rectangular case 1604, and the secondary coil 1614 and the printed circuit board 1628 are provided therein. Doing. The outer diameter (outer diameter) of the secondary coil 1614 and the width of the printed circuit board 1628 are approximately equal to the thickness of the rectangular secondary battery 1611, and are provided below the rectangular secondary battery 1611. . The printed circuit board 1628 is installed insulated from the secondary battery 1611. The printed board 1628 is equipped with an electronic component 1629 that realizes a control circuit and a protection circuit.

The pack battery 1802 shown in FIGS. 18 and 19 incorporates a rectangular secondary battery 1811 in a rectangular case 1804, and the secondary coil 1811 is formed on the side of the rectangular secondary battery 1811. 1814). The secondary coil 1814 is provided with the central axis on the side of the case 1804 in the longitudinal direction of the case 1804 and the battery, that is, in the vertical direction of the figure. The rectangular case 1804 has a width wider than that of the rectangular secondary battery 1811, and has a gap provided in the side of the rectangular case 1804. The gap is provided with a secondary coil 1814 at the lower portion thereof and a printed circuit board 1828 at the upper portion thereof. The pack battery 1802 of this figure has the same structure as the pack battery shown in FIG. 16 and FIG. 17, and can be attached or detached to the portable electric device 1803 freely.

In the pack battery 2002 of FIG. 20, a secondary coil 2014 and a printed circuit board 2028 are provided at the bottom of the case 2004 in the lower portion of the rectangular secondary battery 2011. In the pack battery 2002 shown in this drawing, the central axis of the secondary coil 2014 is provided on the bottom of the case 2004 in the horizontal direction of the case 2004 and the battery, that is, the left and right directions of the drawing. The primary coil 2013 and the secondary coil 2014 are arranged with the central axis installed on a straight line.

Therefore, the primary coil 2013 which conveys electric power to the secondary coil 2014 provided in this direction is built in the charging base 2001 as shown in FIG. 20 with the center axis to the left-right direction.

The above pack battery is provided with the secondary coil away from the wide front and back surfaces of the rectangular secondary battery and approaching the narrow width surface. In the pack battery of this structure, the outer can of the rectangular secondary battery can be made of aluminum, aluminum alloy, iron or iron alloy. This is because the secondary coil installed there can be less affected by the outer can.

As described above, the pack battery which is separated from the wide front and rear surfaces of the square battery and installs the secondary coil on the narrow surface has less influence of the rectangular outer can, and efficiently transfers power from the primary coil to the secondary coil. There is a feature to do. Since the secondary coil installed at this position can reduce the influence of the outer can, it is possible to efficiently transfer electric power from the primary coil to the secondary coil by using aluminum or aluminum alloy without specifying the outer can as iron. There is a special feature.

The pack battery 2102 of FIG. 21 attaches the secondary coil 2114 to the wide front and back surfaces 2112A of the rectangular secondary battery 2111. The pack battery 2102 makes the case 2104 thicker than the rectangular secondary battery 2111, closely adheres to the wide front and rear surfaces 2112A of the rectangular secondary battery 2111, and the secondary coil 2114. It is built. The secondary coil 2114 is embedded in the case 2104 of the pack battery 2102 with the central axis in a posture perpendicular to the wide front and rear surfaces 2112A. The charging base 2101 incorporates the primary coil 2113 at a position approaching the secondary coil 2114 such that the central axes of the secondary coil 2114 and the primary coil 2113 are in a straight state.

The pack battery 2102 in which the secondary coil 2114 is provided on the wide front and rear surfaces 2112A of the rectangular secondary battery 2111 is used for iron or iron for the external can 2112 of the secondary battery 2111 therein. It is made of alloy. When the outer can 2112 of the square secondary battery 2111 influences the electric power induced by the secondary coil 2114, and the outer can 2112 is made of aluminum or an aluminum alloy, the secondary coil 2114 This is because the voltage-current characteristics outputted from the display are deteriorated. The steel outer can 2112 is suitably coated with metal plating such as nickel or chromium so as not to rust.

In addition, the outer can made of iron alloy is suitable for metal, such as stainless, which is difficult to rust.

In addition, the pack battery 502 of FIG. 5 incorporates a cylindrical secondary battery 511 in which the outer can 512 is made of iron or iron alloy in the cylindrical case 504. The case 504 can be placed in a cylindrical insertion portion (not shown) provided at the bottom of the portable electric device, mounted on the portable electric device, and set and charged in a charging stand through the portable electric device.

The above pack battery is mounted on a portable electric device, and the portable battery is charged by being mounted on a charging stand. However, the above-described pack battery may be mounted directly on a charging stand and charged without being mounted on a portable electric device.

As described above, a pack battery having a secondary battery of an outer can made of iron or iron alloy can efficiently transfer power from the primary coil to the secondary coil even though the secondary coil is installed close to the secondary battery. There are features that can be. In particular, there is a feature that the secondary coil is installed on the wide front and rear surfaces of the square battery, which is susceptible to external cans, and can efficiently transfer electric power from the primary coil to the secondary coil.

In the pack battery, AC power is induced from the primary coil to the secondary coil, and the AC power is controlled by a control circuit to charge the built-in secondary battery.

The pack battery of this structure has a feature that can be charged in a contactless manner without providing a charging terminal. This is because the control circuit controls the power generated in the secondary coil embedded in the pack battery to charge the secondary battery. Therefore, the pack battery can charge the secondary battery by controlling the power induced in the secondary coil built in the control circuit without supplying and charging the charging power from the portable electric device. Therefore, the pack battery does not need to be connected to the portable electric apparatus through the contact in order to charge the secondary battery.

The pack battery can be fully charged (fully charged) by monitoring the state of charge of the secondary battery in a control circuit built therein.

The pack battery to be charged in this state does not need to connect the terminal for charging to the portable electric device and the charging stand, nor does it need to connect the terminal for detecting the state or type of the battery to be charged. The pack battery is in a completely contactless state, and the secondary battery can be charged in an ideal state.

In addition, the pack battery of the present invention does not supply charging power to a portable battery by charging power from a charging stand to a portable electrical device. In the charging station, the charging power is supplied directly to the pack battery in a contactless state by using the action of electromagnetic induction without passing through the portable electric device. The pack battery charged in this state can be charged from the charging stand without going through the portable electric device. Therefore, the pack battery can be charged directly from the charging stand without being mounted on the portable electric device.

This structure charges a spare pack battery with a charging stand, and realizes the feature which can be used conveniently.

In addition, the pack battery of the present invention eliminates the charging failure of the secondary battery due to the poor contact of the charging contact, and realizes the characteristic that the secondary battery can be charged in an ideal state safely and without charging the battery performance. do.

This is because the pack battery incorporates both the secondary coil and the control circuit to charge the secondary battery by controlling the power induced in the secondary coil in the control circuit.

In addition, the pack battery, which is separated from the wide front and rear surfaces of the square battery and the secondary coil is installed on the narrow width surface, can reduce the influence of the rectangular outer can and efficiently transfer power from the primary coil to the secondary coil. There is a special feature. Since the secondary coil installed at this position can reduce the influence of the outer can, it is possible to efficiently transfer electric power from the primary coil to the secondary coil by using aluminum or aluminum alloy without specifying the outer can as iron. There is a special feature.

In addition, a pack battery containing a secondary battery of an outer can made of iron or iron alloy can efficiently transfer electric power from the primary coil to the secondary coil even though the secondary coil is installed close to the secondary battery. There is a special feature. In particular, there is a feature that the secondary coil is installed on the wide front and rear surfaces of the square battery, which is susceptible to external cans, and can efficiently transfer electric power from the primary coil to the secondary coil.

Claims (28)

A secondary battery, a case containing the secondary battery, a secondary coil embedded in the case and excitation from the outside to output alternating current, and a secondary electric power that controls and integrates power induced in the secondary coil. A pack battery having a control circuit for charging the paper. The method of claim 1, A pack battery that has a built-in printed circuit board, which has a secondary coil on one side and electronic components constituting a control circuit on the other side. The method of claim 1, A pack battery in which a case has a printed circuit board and an electronic component constituting a secondary coil and a control circuit on one side of the printed circuit board. The method of claim 1, A pack battery in which a case has a built-in protection circuit, and the switching element of the control circuit which is switched from ON to OFF when the secondary battery is fully charged is used together as a current blocking element of the protection circuit. The method of claim 1, A pack battery in which a case contains a cylindrical secondary battery and a secondary coil is installed coaxially with the battery at the end of the cylindrical battery. The method of claim 1, A pack battery in which a case incorporates a control circuit and a protection circuit, and the control circuit includes a calculation circuit, and the calculation circuit of the control circuit is used together as the calculation circuit of the protection circuit. The method of claim 1, A pack battery in which an outer can of a secondary battery incorporated in a pack battery is made of iron or iron alloy. The method of claim 7, wherein The pack battery which an outer can of the secondary battery built into a pack battery is made of stainless steel. The method of claim 7, wherein A pack battery made of iron with an outer can of the secondary battery housed in the pack battery. The method of claim 1, The pack battery has a rectangular secondary battery having a wider width than the thickness thereof, and the outer can of the rectangular battery has a wide surface and a rear surface which are located before and after, and a narrow width surface having both sides and top and bottom surfaces. A pack battery in which secondary coils are removed from a wide surface and a rear surface of an outer can of a secondary battery and are installed to approach a narrow width surface. The method of claim 10, A pack battery in which the outer can of the secondary battery is made of aluminum or aluminum alloy. The method of claim 10, A pack battery in which the outer can of the secondary battery is made of iron or iron alloy. The method of claim 10, Packed battery in which outer can of secondary battery is made of stainless steel. The method of claim 10, A pack battery made of iron with an outer can of a secondary battery metal-plated on its surface. A case of a pack battery which can be detachably attached to a portable electric device, a secondary battery built in a case of a pack battery, a secondary coil embedded in a case of a pack battery and excited from the outside to output AC, and a secondary coil The control circuit for charging the secondary battery which controls and induces the electric power induced in the battery, the case of the charging stand which detachably mounts the portable electric equipment equipped with the pack battery, and the case of the charging stand is excited by AC A pack battery and a charging station having a primary coil which generates alternating current in the secondary coil of the pack battery by the action of induction. The method of claim 15, A pack battery and a charging stand that contain a printed circuit board with a printed circuit board, which has a secondary coil on one side and electronic components constituting a control circuit on the other side. The method of claim 15, A pack battery and a charging stand in which a case of a pack battery has a printed circuit board, and on one side of the printed circuit board are mounted electronic components constituting a secondary coil and a control circuit. The method of claim 15, A pack battery and a charging stand in which a case of a pack battery has a built-in protection circuit, and a switching element of a control circuit which is switched from ON to OFF when the secondary battery is fully charged is used as a current blocking element of the protection circuit. The method of claim 15, A pack battery and a charging stand in which a case of a pack battery has a cylindrical secondary battery, and a secondary coil is installed coaxially with the battery at the end of the cylindrical battery. The method of claim 15, A pack battery and a charging stand in which a case of a pack battery has a built-in control circuit and a protection circuit, and the control circuit includes a calculation circuit, and the calculation circuit of the control circuit is used as a calculation circuit of the protection circuit. The method of claim 15, A pack battery and a charging stand in which an outer can of a secondary battery built in a pack battery is made of iron or iron alloy. The method of claim 21, A pack battery and a charging stand in which an external can of a secondary battery built in a pack battery is made of stainless steel. The method of claim 21, Packed battery and charging stand made of iron, with the outer can of the secondary battery built into the pack battery metal-plated. The method of claim 15, The pack battery has a rectangular secondary battery having a wider width than the thickness thereof, and the outer can of the rectangular battery has a wide surface and a rear surface which are located before and after, and a narrow surface having both sides and top and bottom surfaces. A pack battery and a charging stand in which a secondary coil is installed away from the wide surface and the back side of the outer can of the secondary battery and is approached by the narrow width surface. The method of claim 24, Packed battery and charging stand in which the outer can of the secondary battery is made of aluminum or aluminum alloy. The method of claim 24, Packed batteries and charging stand in which the outer can of the secondary battery is made of iron or iron alloy. The method of claim 24, Packed battery and charging stand in which the outer can of the secondary battery is made of stainless steel. The method of claim 24, Packed battery and charging stand made of iron, with the outer can of the secondary battery metal-plated.